The latest game in the long-running "Fallout" series puts players in "The Commonwealth," which is essentially the Boston metropolitan area (think: Cambridge, Jamaica Plains, etc. in addition to Boston itself). "Fallout 4's" contribution to the series is a building system, which enables players to create some unbelievable settlements: places where you and other settlers can live, ranging from small homes to...well:

Bethesda Game Studios

Indeed. Here are the best player-created settlements we've found thus far, care of Reddit and Imgur and forums.

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One player is building a "small" home on an abandoned barge:

Bethesda Game Studios

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It's made up entirely of shipping containers, as one does.

Bethesda Game Studios

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At least it's got a nice-ish view!

Over there you'll see irradiated water from the nuclear apocalypse! And over there, um, more of that!
Bethesda Game Studios

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Not content to create a living space, one player took things to the limit and created this massive re-creation of a Rubik's Cube:

Bethesda Game Studios

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It's powered by over 180 generators.

Creations like this require the PC version of the game plus some modifications to the standard game, which enable players to create things that are too large or detailed for the game on a standard computer.Bethesda Game Studios

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But forget about barge homes and massive Rubik's Cubes — this is the largest settlement we've seen yet, and it's almost certainly the most detailed.